3-Way Pressure-Reducing Cartridge, Size 2 4

Transcription

1 -Way Pressure-Reducing Cartridge, Size 2 Q max = 2 l/min, p max = 25 bar Spool-type design, direct acting, with manual adjustment 1 Description Compact construction for cavity type AM /- UNF to Bucher standards 5 pressure ranges available Full-flow secondary pressure relief Excellent stability over the whole pressure and flow range Available with hand-knob All exposed parts with zinc-nickel plating Can be fitted in a line-mounting body Series DDRB-7M... screw-in cartridges are direct acting, spool-type high performance -way pressure-reducing valves. They are available in sizes 2... and have a /- UNF mounting thread. The straightforward design delivers an outstanding price/performance ratio and good pressure/ flow ratings. The valves control the required secondary pressure in port to the value set with the pressure adjustment, and independently of the inlet pressure in port 2. In control mode, the connection 2 opens until the pressure in port reaches the preset level. If the pressure rises above the preset level, the control spool opens the 1 connection until balance is restored. These -way pressure-reducing cartridges function as full-flow pressure relief valves from port 1 as soon as the reduced pressure rises above the valve pressure setting. Five spring ranges are available in order to obtain precise pressure settings over the whole of the required pressure range. These -way pressure-reducing cartridges are predominantly used in mobile and industrial applications for reducing a system pressure. All external parts of the cartridge are zinc-nickel plated to DIN and are thus suitable for use in the harshest operating environments. If you intend to manufacture your own cavities or are designing a line-mounting installation, please refer to the section Related data sheets. 2 Symbol 2 1 Technical data General characteristics Designation Design Mounting method Tightening torque Size Weight Mounting attitude Ambient temperature range Description, value, unit -way pressure-reducing cartridge Spool-type design, direct acting, with manual adjustment screw-in cartridge /- UNF 5 Nm ± 1 % nominal size 2, cavity type AM.2 kg unrestricted -25 C + C Reference: -P-2651-EN-1 Issue:.212 / Replaces: D /5

2 Hydraulic characteristics Maximum operating pressure Maximum flow rate Nominal pressure ranges Pressure adjustment range Leakage flow rate Flow direction - 25 bar - bar - 1 bar - 6 bar - bar Description, value, unit 25 bar 2 l/min bar, 6 bar, 1 bar, bar, 25 bar 25 bar (1 turn bar) bar (1 turn 2 bar) 1 bar (1 turn 19 bar) 6 bar (1 turn 1 bar) bar (1 turn 5 bar) < cm /min (with p 2 25 bar) with oil viscosity mm 2 /s (cst) see symbol Hydraulic fluid HL and HLP mineral oil to DIN 51 52; for other fluids, please contact BUCHER Hydraulic fluid temperature range Viscosity range Minimum fluid cleanliness Cleanliness class to ISO 6 : C + C 1 65 mm 2 /s (cst), recommended mm 2 /s (cst) class 2/1/15 Performance graphs measured with oil viscosity mm 2 /s (cst) p = f (Q) Pressure - Flow rate characteristic [p N = bar] 5 P15.ai p = f (Q) Pressure - Flow rate characteristic [p N = 6 bar] 1 P.ai /5 -P-2651-EN-1/.212 / Replaces:D-2.17

3 p = f (Q) Pressure - Flow rate characteristic [p N = 1 bar] 125 P17.ai p = f (Q) Pressure - Flow rate characteristic [p N = bar] 2 P1.ai p = f (Q) Pressure - Flow rate characteristic [p N = 25 bar] P19.ai P-2651-EN-1/.212 / Replaces:D-2.17 /5

4 5 Dimensions & sectional view 6 Installation information With adjusting screw S s 1 When fitting the cartridges, use the specified tightening torque. Set the required pressure with the adjusting screw (s 1 ). After you have set the valve, lock the adjusting screw with the lock nut Ma= 5 [Nm] 1 % Air-bleeding: If necessary, air can be purged from these -way pressure-reducing cartridges by using the integral bleed groove (Item E). The procedure is as follows: Ma= 5 [Nm] 1 % E Steps:. Slacken the air-bleed screw (17 A/F) approx. 2 turns. 5. Switch the cartridge (ON/OFF) several times until no more air bubbles escape. 6. Tighten (Ma = 5 Nm ± 1 %) the air-bleed screw ATTENTION! Only qualified personnel with mechanical skills may carry out any maintenance work. Generally, the only work that should ever be undertaken is to check, and possibly replace, the seals. When changing seals, oil or grease the new seals thoroughly before fitting them. 5 Seal kit NBR no. DS-29-N 1) Item Qty. Description 1 1 O-ring no ,17 x 1,7 N9 With hand-knob adjuster H O-ring no. 1 12,2 x 1,7 N9 1 O-ring no. 1 1,2 x 1,7 N9 2 Backup ring 1,7 x 1,5 x 1, FI Backup ring 9, x 1,5 x 1, FI ) Seal kit with FKM (Viton) seals, no. DS-29-V /5 -P-2651-EN-1/.212 / Replaces: D-2.17

5 7 Ordering code Ex. D DR B - 7 M S _ - 1 D = pressure-control valve DR = direct acting pressure reducing cartridge A... Q = standard model - see relevant data sheets Z... R = special features - please consult BUCHER 7 = pressure function 7 (-way pressure function) M = cavity type AM 2 = nominal size 2 for pressure range 25 and = nominal size for pressure range 1, 6 and 25 = pressure range 25 bar = pressure range bar 1 = pressure range 1 bar 6 = pressure range 6 bar = pressure range bar S = screw adjuster (standard) H = hand-knob adjuster (blank) = NBR (Nitrile) seals (standard) V = FKM (Viton) seals (special seals - please contact BUCHER) = design stage (omit when ordering new units) Related data sheets Reference (Old no.) Description -P-11 (i-2) The form-tool hire programme -P-11 -P Cavity type AM Line-mounting body, type GAMA (G / ) info.ch@bucherhydraulics.com by Bucher Hydraulics AG Frutigen, CH-71 Frutigen All rights reserved. Data is provided for the purpose of product description only, and must not be construed as warranted characteristics in the legal sense. The information does not relieve users from the duty of conducting their own evaluations and tests. Because the products are subject to continual improvement, we reserve the right to amend the product specifications contained in this catalogue. Classification: P-2651-EN-1/.212 / Replaces:D /5